r300/compiler: Add support for the output modifier (OMOD)

1 files changed, 16 insertions, 0 deletions

diff --git a/src/gallium/drivers/r300/compiler/radeon_variable.c b/src/gallium/drivers/r300/compiler/radeon_variable.c
index 938fb8421f2..7c640c4f621 100644
--- a/src/gallium/drivers/r300/compiler/radeon_variable.c
+++ b/src/gallium/drivers/r300/compiler/radeon_variable.c
@@ -498,6 +498,22 @@ struct rc_list * rc_variable_list_get_writers(
 	return writer_list;
 }
 
+struct rc_list * rc_variable_list_get_writers_one_reader(
+	struct rc_list * var_list,
+	unsigned int src_type,
+	void * src)
+{
+	struct rc_list * writer_list =
+		rc_variable_list_get_writers(var_list, src_type, src);
+	struct rc_list * reader_list =
+		rc_variable_readers_union(writer_list->Item);
+	if (rc_list_count(reader_list) > 1) {
+		return NULL;
+	} else {
+		return writer_list;
+	}
+}
+
 void rc_variable_print(struct rc_variable * var)
 {
 	unsigned int i;